Indexed by: Article

First Author: Shuai You

Correspondence Author: Xiong Li

Journal: Science

Included Journals: SCI

Discipline: Engineering

First-Level Discipline: Other specialties in Optical Engineering

Document Type: J

Volume: 379

Issue: 6629

Page Number: 288-294

DOI number: 10.1126/science.add8786

Date of Publication: 2023-01-19

Impact Factor: 63.832

Abstract: High-quality perovskite light harvesters and robust organic hole extraction layers are essential for achieving high-performing perovskite solar cells (PSCs). We introduce a phosphonic acid–functionalized fullerene derivative in mixed-cation perovskites as a grain boundary modulator to consolidate the crystal structure, which enhances the tolerance of the film against illumination, heat, and moisture. We also developed a redox-active radical polymer, poly(oxoammonium salt), that can effectively p-dope the hole-transporting material by hole injection and that also mitigates lithium ion diffusion. Power conversion efficiencies of 23.5% for 1-square-centimeter mixed–cation-anion PSCs and 21.4% for 17.1-square-centimeter minimodules were achieved. The PSCs retained 95.5% of their initial efficiencies after 3265 hours at maximum power point tracking under continuous 1-sun illumination at 70° ± 5°C.